Verra, Isometric, Puro.earth, Gold Standard, and EBC: Which standard is best suited for a biochar project?

Verra, Isometric, Puro.earth, Gold Standard, and EBC: Which standard is best suited for a biochar project?

Selecting a biochar standard is not merely a technical step in the certification process. It is a strategic decision that directly impacts the ability to issue carbon credits, selling prices, target buyer groups, audit costs, the design of the MRV system, and the project’s long-term reputation.

With the same pyrolysis plant, the same type of agricultural byproduct, and the same biochar product, choosing Verra, Isometric, Puro.earth, Gold Standard, or EBC can lead to very different commercial pathways. Some standards are better suited for the large-scale voluntary carbon market. Some standards emphasize high-quality carbon removal. Others place a strong emphasis on co-benefits for sustainable development. And there are standards primarily focused on certifying biochar quality, product safety, and traceability.

This article compares biochar standards from a decision-making perspective: which standard your project should choose, under what circumstances, and given what data and commercial objectives.

Overview: Why is selecting standards a strategic decision for the biochar project?

In a biochar project, standards are not merely a set of rules for filling out forms. Standards determine how a project demonstrates the amount of CO2e removed or emissions reduced, how lifecycle emissions are calculated, the requirements for independent auditing, the timing of credit issuance, and the extent to which the project is accepted by the market.

If the primary goal is to sell carbon credits, the standard will influence whether buyers trust those credits. If the goal is to sell physical biochar for agriculture, construction materials, or environmental remediation, product quality certification may be just as important as carbon certification. If the goal is to raise capital, the chosen standard will be part of the project due diligence process, as investors need to know whether the carbon revenue stream is truly viable.

There is no single "best" biochar standard for every project. A small-scale project using local agricultural byproducts, selling biochar to smallholder farmers, and just beginning to collect data will have very different needs compared to an industrial plant with long-term credit purchase contracts with a technology company. Therefore, the right question is not which standard is the most well-known, but which standard is best suited to the project’s objectives, scale, market, and operational capabilities.

It is important to distinguish between three types of certification that are often confused: carbon credit certification, carbon removal or carbon sink certification, and biochar quality certification. Verra, Isometric, Puro.earth, Gold Standard, and EBC are all related to biochar, but they do not serve the same purpose in the same way.

What type of certification does biochar require?

Before comparing each standard, the project must determine what type of certification it needs. This is a foundational step, as many projects make the wrong choice from the start due to confusion between carbon credit certification and product quality certification.

Carbon credit certification is used to issue credits on the voluntary market or to support a company’s climate goals. This type of certification answers the following questions: How many tons of CO2e has the project removed or reduced? Has that amount been calculated reliably? Has there been any double-counting? And does it meet additionality requirements?

Carbon removal certification emphasizes that carbon has been removed from the atmospheric cycle and stored for a sufficiently long period. With biochar, the focus typically lies on the carbon’s durability within the material, emissions during production, feedstock sources, energy consumption, transportation, and end uses.

Biochar quality certification focuses on the physical properties of the product. It addresses questions such as whether the biochar is safe, whether it contains heavy metals above the threshold levels, what the PAH content is, whether the feedstock is suitable, whether the pyrolysis process is properly controlled, and whether the product is suitable for its intended use.

A project may require a combination of certifications. For example, a biochar producer looking to sell its products in the European market may need EBC certification to demonstrate quality and traceability. If that same project wishes to issue carbon removal credits, it may also need Puro.earth, Isometric, or Verra certification, depending on its commercial strategy.

How do carbon credits differ from biochar quality certifications?

Carbon credits and biochar quality certifications often share common input data, but have different objectives.

Carbon credits focus on climate outcomes: how much CO2e is removed or reduced, over what timeframe, relative to which baseline, whether there are leakage emissions, and who holds the rights to claim those climate benefits. Buyers of carbon credits typically evaluate MRV, additionality, permanence, reversal risk, lifecycle emissions, and the integrity of the documentation.

Biochar quality certification focuses on product characteristics such as carbon content, ash content, moisture content, pH, heavy metals, PAHs, feedstock, processing temperature, production conditions, and application potential. Buyers of biochar typically need to know whether the product is safe for their soil, crops, materials, or industrial processes.

A project with carbon credits does not necessarily mean that the biochar always meets all product quality standards. Conversely, a biochar product that has obtained quality certification does not automatically generate carbon credits that can be sold on the international market. This point needs to be clarified in contracts, sales materials, and ESG statements.

Criteria for comparing biochar standards

To select the appropriate standard, it is advisable to evaluate multiple criteria simultaneously rather than relying solely on reputation. A standard with a strong reputation but excessive costs, overly complex data requirements, or one that is not suitable for the target audience may not be the optimal choice.

Key criteria include:

• The level of recognition in the carbon credit market and the ability to reach buyers.
• MRV requirements, including measurement, reporting, verification, operational data, and independent audits.
• Suitable for small, medium, or industrial-scale projects.
• Suitability based on geography, feedstock type, pyrolysis technology, and the end use of biochar.
• Certification costs, consulting fees, audit fees, registration time, and credit issuance time.
• The potential price of credits and the target buyer group’s willingness to pay.
• Compatibility with product quality certifications or other carbon sink certifications.

A good project should start with the business question: Who will buy the credits or the biochar? What standards do they accept? What data do they require? And are they willing to pay a premium for higher certification standards?

Verra: Suitable for projects seeking to access the large-scale voluntary carbon market

Verra is one of the most widely recognized voluntary carbon standards globally. For many credit buyers, project developers, brokers, and investors, Verra is a familiar name when it comes to the voluntary carbon market.

For biochar, Verra is suitable for projects seeking broad market access, requiring a standard that is widely recognized and planning to issue credits over many years. This is often a viable option for medium- to large-scale projects with a technical team, robust operational data, and the capacity for long-term record-keeping.

Verra’s strengths lie in its brand recognition and market ecosystem. If a project needs to raise capital, negotiate carbon credit purchase agreements, or work with international partners, a widely adopted standard can help reduce communication barriers. However, widespread adoption also comes with stringent requirements for documentation, due diligence, verification, and governance.

Advantages of Verra

Verra has a strong brand presence in the voluntary carbon market. This makes its credits more recognizable in discussions with corporate buyers, investors, and intermediaries.

The ecosystem surrounding Verra is also quite extensive, comprising project developers, assessors, verifiers, brokers, trading platforms, and buyers. For projects looking to scale up or build a portfolio of carbon projects, this is a significant advantage.

Verra is also suitable for businesses looking to standardize their project development processes so they can be scaled across multiple locations. Once an MRV framework, operational documentation, and data control processes are well-established, the project can more easily manage the periodic issuance of credits.

Limitations to consider

Verra may not be the least bureaucratic option. Projects must prepare detailed documentation, demonstrate a baseline, account for additionality, life-cycle emissions, leakage, and the permanence of stored carbon. These requirements are not an obstacle if the project has the necessary technical capacity, but they can be a burden for small or newly operational projects.

Transaction costs should also be factored in early on. Consulting fees, audit fees, staff time, laboratory analysis, and record-keeping costs can reduce profits if credit yields are low. Therefore, for small projects, it is important to calculate the certification cost per ton of CO2e before making a decision.

Which projects should choose Verra?

Verra is suitable for medium- to large-scale biochar projects with stable production volumes, reliable operational data, and the goal of reaching international credit buyers. It is also a sensible choice if a project requires a highly recognized standard to support fundraising, negotiate credit purchase agreements, or expand to multiple locations.

If the project is still in the pilot phase, lacks a stable measurement system, has unclear biochar output, or has not identified a buyer for the credits, you should prepare baseline data before rushing to register.

Isometric: Suitable for high-quality carbon removal and technology buyers

Isometric has established a strong presence in the high-quality carbon removal sector, where buyers are not only concerned with the quantity of credits but also place great emphasis on scientific rigor, data, transparency, and verifiability.

With biochar, Isometric is well-suited for projects looking to sell credits to high-end buyers, particularly tech companies, climate funds, or organizations with stringent credit purchasing standards. These buyers typically want a clear understanding of how carbon removal is calculated, lifecycle emission risks, the sustainability of carbon storage, and the quality of MRV.

While Verra has the advantage of broad market recognition in the voluntary market, Isometric stands out for its ability to position credits as a highly transparent carbon removal product. This could support better pricing, but in return, the project must be prepared to invest more in data.

Advantages of Isometric

Isometric emphasizes transparency, scientific methods, and verifiable data. This is an advantage in a market where buyers are becoming increasingly cautious about the quality of carbon credits.

For biochar projects featuring digitalized operational systems, raw material weighing, energy tracking, production monitoring, regular laboratory analysis, and end-use monitoring, Isometric may be the ideal platform for verifying carbon removal quality.

Isometric also appeals to buyers seeking carbon removal credits rather than traditional emission reduction credits. In many corporate climate strategies, carbon removal is viewed as a credit category playing an increasingly important role in addressing hard-to-abate emissions.

Limitations to consider

Data requirements and MRV standards may be stringent. The project must document details regarding feedstock sources, moisture content, input quantities, pyrolysis conditions, energy consumption, biochar yield, carbon content, carbon stability, transportation, and end uses.

If the project lacks technical capacity or does not yet have a consistent data system, preparation costs may be significant. In this case, the project may need to invest in sensors, scales, data management software, sampling procedures, and an MRV partner before registration.

Which projects should use isometric views?

Isometric is suitable for biochar projects that aim to position themselves as premium carbon removal solutions, with transparent operational data and targeting corporate buyers with stringent standards. This is a good choice if the project is willing to invest more in MRV in exchange for greater reliability and higher commercial value.

Conversely, if the project prioritizes a simple, low-cost process or lacks the capability to verify detailed data, Isometric may not be the best first step.

Puro.earth: Suitable for carbon removal projects with a clear need for rapid commercialization

Puro.earth is a leading platform in the carbon removal market. Puro.earth’s credit units, commonly known as CORCs, are linked to certified carbon removal activities. Biochar is one of the solution categories that frequently attracts attention within the carbon removal sector.

Puro.earth is ideal for projects seeking to reach buyers who are already familiar with the concept of carbon removal and are looking for credits with a clear commercial narrative. Compared to some traditional carbon standards, Puro.earth is more directly focused on carbon removal, which makes the communication process with buyers easier to understand.

However, Puro.earth is not a shortcut to bypass data. The project must still demonstrate carbon sequestration, lifecycle emissions, and the sustainability of raw materials, production processes, and end uses.

Advantages of Puro.earth

A major advantage of Puro.earth is its clear focus on carbon removal. For corporate buyers seeking carbon removal solutions rather than merely offsetting emissions, this positioning holds significant commercial value.

Puro.earth also has a relatively niche buyer market. This aligns well with projects that already have established products, wish to commercialize carbon removal credits, and require a mechanism recognized by many stakeholders within the CDR sector.

Presenting credits using the carbon removal logic also helps biochar projects better demonstrate their value: biomass byproducts are converted into stable, carbon-rich material, which is then stored in the soil or used for other applications over a sufficiently long period, after accounting for lifecycle emissions.

Limitations to consider

The project must meet strict requirements regarding the lifecycle data and the long-term stability of stored carbon. The supply chains for raw materials, energy sources, transportation, production, and end-use applications must all be clearly described.

Puro.earth does not fully replace product quality certification if biochar is sold for use in the agricultural, construction materials, or environmental treatment markets. Buyers of physical biochar may still require specifications, laboratory analyses, or standards such as EBC.

Which projects should choose Puro.earth?

Puro.earth is well-suited for projects seeking to issue high-value carbon removal credits, with stable biochar production and clear end-use applications. If a project already has a consistent production process, robust data, and aims to reach voluntary buyers willing to pay a premium for carbon removal, Puro.earth is a viable option.

This is also a suitable option if the project wants to clearly communicate that the primary product in the carbon market is carbon removal, not just emissions reduction.

Gold Standard: Suitable for projects that prioritize sustainable development

The Gold Standard has a strong reputation for environmental integrity, sustainable development, and shared benefits. In the context of biochar projects, this standard is particularly noteworthy because such projects not only achieve carbon removal but also have significant social and environmental impacts.

For example, a biochar project that works with smallholder farmers, processes agricultural byproducts, reduces open-air burning, improves soil quality, increases water retention, supports livelihoods, and reduces air pollution has a very different impact story than an industrial project focused solely on maximizing credit output. In such cases, the Gold Standard can help the project demonstrate its sustainable development value in a more structured way.

However, the project needs to verify the specific application methods for biochar and the eligibility criteria at the time of implementation. It should not be assumed that all biochar models are automatically suitable.

Advantages of the Gold Standard

Gold Standard has a strong reputation for sustainable development and shared benefits. This is valuable to credit buyers who are interested in ESG, the SDGs, community impact, and non-carbon narratives.

For projects related to regenerative agriculture, cooperatives, smallholder farms, or the processing of local byproducts, the Gold Standard can help highlight benefits related to livelihoods, health, land, and the environment.

Some buyers of carbon credits don’t just ask how many tons of CO2e are involved; they also ask what positive changes the project brings to the community. This is where the Gold Standard has an advantage.

Limitations to consider

The process of demonstrating shared benefits may increase the documentation requirements. The project may need to consult with stakeholders, describe social impacts, track sustainable development indicators, and submit periodic reports.

If a project aims solely to optimize the pace of credit issuance or lacks a distinct community component, the Gold Standard may not be the most effective option. Additionally, it is important to carefully assess current methodologies, the scope of application, and local requirements.

Which projects should choose the Gold Standard?

The Gold Standard is suitable for biochar projects working with smallholder farmers, cooperatives, agricultural supply chains, or sustainable development programs. Projects have an advantage if they can demonstrate soil improvement, reduced pollution, improved livelihoods, community support, and contributions to the SDGs.

If a project has the capacity to conduct community consultations, monitor sustainable impacts, and communicate its ESG story, the Gold Standard is an option worth considering.

EBC: Compliant with biochar quality certification and the European market

The EBC, or European Biochar Certificate, is widely regarded as one of the key standards for biochar quality, safety, and traceability. Unlike standards that primarily focus on the issuance of international carbon credits, the EBC places particular emphasis on the physical product itself.

EBC is suitable for biochar producers seeking to sell their products in the agricultural, construction materials, and environmental treatment markets, or in markets with high-quality requirements. This standard helps demonstrate that the biochar is produced from suitable raw materials, under controlled contamination conditions, with characteristic analyses, and meets specific technical criteria.

In many cases, the EBC can serve as a foundation of trust for biochar products. If buyers want to know whether a product is safe for the soil, has a clear origin, or undergoes quality control, the EBC is an important indicator.

Advantages of EBC

EBC is well-suited for demonstrating the quality and safety of biochar. This standard supports the traceability of raw materials, control of production processes, and the determination of product characteristics.

For the European market or customers with strict technical requirements, EBC can provide a clear competitive advantage. Distributors, fertilizer manufacturers, agricultural projects, or material suppliers can have greater confidence when products are certified as compliant.

EBC can also support carbon strategies if properly integrated with carbon sink mechanisms or other carbon removal standards. However, the scope of the claims must be clearly defined to avoid confusion between quality certification and carbon credits.

Limitations to consider

EBC should not be viewed as a direct substitute for all carbon credit standards. If the primary objective is to sell international carbon credits to voluntary buyers, the project may need to incorporate Verra, Puro.earth, or Isometric, depending on buyer requirements and the methodology used.

The viability of the EBC depends on the biochar market. If the project does not sell physical biochar to a market that requires product certification, the commercial value of the EBC must be weighed against the costs.

Which projects should choose EBC?

EBC is ideal for biochar producers looking to demonstrate the quality of their products, particularly when targeting the European market, agricultural customers, distributors, or technical partners. It is also a good choice for projects that wish to both sell physical biochar and build a data foundation for future carbon credit development.

In this integrated strategy, EBC can serve as the product certifier, while Verra, Puro.earth, or Isometric can serve as the certifiers for carbon credits or carbon removal.

Quick Comparison Chart: Verra, Isometric, Puro.earth, Gold Standard, and EBC

The table below is for reference only. Before applying, the project must still verify the latest version of the methodology, eligibility criteria, local requirements, and buyer acceptance.

How to Choose the Right Standards for a Biochar Project

When selecting standards, you should start with your business objectives and then consider technical requirements. If the project hasn’t identified its target market, certification to any standard could become a sunk cost.

Select by business objective

If the goal is to sell carbon credits on the broader voluntary market, Verra is an option worth considering due to its high profile and extensive market ecosystem.

If the goal is to sell high-quality carbon removal credits to discerning buyers, Isometric may be a better fit due to its transparent and science-based approach.

If the goal is to commercialize carbon removal among buyers already familiar with CDR, Puro.earth is an option worth considering.

If a project aims to maximize its narrative around social impact, agriculture, livelihoods, and the SDGs, the Gold Standard can provide a competitive edge.

If the primary goal is to sell physical biochar and demonstrate product quality, EBC is typically a more suitable choice than purely carbon-based standards.

Select by project size

Small-scale projects should pay particular attention to the certification costs per ton of CO2e. If credit output is low, consulting, auditing, and documentation management costs can eat into a significant portion of revenue. In such cases, projects may start with quality certification, project aggregation programs, or partnerships with project developers who already have MRV infrastructure in place.

The project can be implemented in phases. The initial phase will focus on data standardization, biochar quality control, and identifying buyers. Carbon credits will be registered in a later phase, once production volumes, processes, and output contracts are sufficiently stable.

Given the project’s large scale, it is advisable to invest early in MRV systems, supply chain controls, laboratory analysis, data software, and output contracts. Given the project’s large scale, errors in data or credit ownership could result in significant losses.

Select by MRV capacity

Projects with detailed operational data will be better aligned with strict carbon removal standards. Key data points include feedstock sources, volume, moisture content, energy consumption, pyrolysis conditions, biochar yield, carbon content, carbon stability, transportation emissions, laboratory analysis, and end-use.

If the project does not yet have a data system in place, it is advisable to establish a measurement process before registration. A common mistake is operating for several months without fully recording the necessary data, making it impossible to verify the potential carbon removal.

MRV should not be treated as an afterthought. When it comes to biochar, MRV must be integrated into operational processes from the very beginning: weighing raw materials, taking samples, maintaining records, controlling production batches, tracking transportation, and documenting end-use.

Quick Decision Matrix

Standard Combination Strategy: Should You Use More Than One Certification?

In many biochar projects, the answer is yes, but it must be managed carefully. Integrating standards can help projects achieve multiple objectives simultaneously: selling physical biochar, issuing carbon credits, meeting buyer requirements, and enhancing the credibility of ESG claims.

For example, a project could use EBC to verify the quality and safety of its biochar product, while using Puro.earth or Isometric to issue carbon removal credits. Another project might choose EBC for the product market and Verra for the broader voluntary carbon market.

However, standardization does not mean that credits are issued twice for the same amount of carbon removal. Double counting is a serious risk. Projects must clearly define project boundaries, credit ownership, environmental claims, traceability records, and mechanisms for canceling or transferring credits.

It is also important to check for compatibility between standards. Certain requirements regarding data, calculation methods, system boundaries, or carbon claims may differ. If not designed from the outset, the project may have to redo documentation, resample, or lose the ability to verify part of its output.

The most appropriate strategy for a project with multiple commercial outputs includes: physical biochar, carbon credits, ESG reporting, and contracts with farmers or industrial partners. However, for smaller projects, pursuing too many certifications at once can increase costs and complexity to a degree that outweighs the benefits.

Common mistakes when selecting biochar standards

The first mistake is to choose a standard based on reputation without considering its ability to meet data requirements and cost considerations. A well-known standard is not automatically suitable if the project lacks sufficient production volume, has no operational track record, or if buyers are unwilling to accept the required price.

The second mistake is failing to clearly identify the buyer from the outset. Standards should be selected based on the requirements of the carbon credit buyer or biochar buyer, not merely on the project team’s own judgment.

The third mistake is underestimating the importance of laboratory analysis and quality control. For biochar, data on carbon content, stability, heavy metals, PAHs, moisture content, and product characteristics can directly impact both carbon certification and quality certification.

The fourth mistake is failing to adequately document data on raw materials, energy, transportation, and end-use. If the data is missing or unreliable, the project may not be able to issue credits for the operational phase.

The fifth mistake is confusing product quality certification with carbon credit certification. While EBC certification may be crucial for biochar quality, if the goal is to sell international carbon credits, the project must still comply with the relevant carbon standards.

The sixth mistake is failing to verify for double counting and credit ownership in the contract. If farmers, raw material suppliers, operators, investors, or biochar buyers all make overlapping environmental claims, the legal and reputational risks can be significant.

MRV Data Checklist Before Applying for Certification

Before selecting a standard, biochar projects should review at least the following data sets:

• Biomass feedstock sources, land use rights, transportation distances, and alternative options in the baseline scenario.
• Raw material volume, moisture content, collection frequency, and storage methods.
• Pyrolysis technology, temperature, residence time, conversion efficiency, and energy consumption.
• Biochar production by batch, carbon content, ash content, moisture content, and safety standards.
• Emissions associated with production, electricity, fuels, transportation, treatment, and end-use.
• Sales records or biochar delivery records, end-use locations, and evidence of long-term storage.
• Sampling procedures, laboratory analysis, record-keeping, and quality control.
• Ownership of carbon credits, ESG disclosure rights, and anti-duplication provisions.

If this data has not yet been reliably recorded, the project should prioritize establishing an MRV system before paying the standard registration fee.

Frequently Asked Questions

What is the best standard for a small-scale biochar project?

There is no one-size-fits-all solution. Since this is a small-scale project, priority should be given to cost-effective standards, feasible data requirements, and a clear buyer. If the audit cost per ton of CO2e is too high, the project could start with quality certification, join a project pooling program, or partner with a carbon project development firm.

Does EBC sell carbon credits?

EBC is primarily known for its role in certifying biochar quality and for its mechanisms related to carbon sinks. However, if the goal is to sell international carbon credits, the project needs to assess buyer acceptance and may need to align with other carbon standards such as Verra, Puro.earth, or Isometric.

How do Verra and Puro.earth differ when it comes to biochar?

Verra has broad recognition in the voluntary carbon market, while Puro.earth focuses more specifically on carbon removal. The choice depends on the target buyer, the methods used, costs, MRV capabilities, and the project’s commercial strategy.

Can multiple standards be registered at the same time?

Quality certification and carbon standards can be combined, but carbon credits must not be issued twice for the same amount of carbon removal. Projects must review the requirements of each standard, manage project boundaries, and clearly define credit ownership.

What data is most important for biochar certification?

Key data includes feedstock, pyrolysis processes, energy consumption, biochar yield, carbon content, carbon stability, transportation emissions, laboratory analysis, and end uses of biochar. Given the strict standards, the data must be traceable, consistent, and independently verifiable.

Conclusion: Which standard is the most appropriate?

Verra is suitable for projects seeking access to a broad voluntary carbon market, with sufficient scale and a need for a highly recognized standard. Isometric is suitable for high-end carbon removal projects with robust data and targeting discerning buyers. Puro.earth is suitable for projects aiming to commercialize carbon removal credits transparently within a specialized market. Gold Standard is suitable for projects with prominent social, agricultural, and sustainable development benefits. EBC is suitable for biochar quality certification, particularly when targeting the European market or clients requiring product standards.

The best choice does not lie in the most well-known standard, but rather in the alignment of business objectives, existing data, certification budget, project scale, and buyer requirements. With biochar, a wise strategy is typically to design the MRV system from the outset, identify buyers early on, review the latest methodologies, and only select a standard after fully understanding the costs, benefits, and risks.

Audit methods, eligibility criteria, and requirements may change over time. Before registering, projects should review the latest documentation for each standard and consult with a carbon expert, legal professional, or appropriate verification body.